What Is a System Boiler? A Modern Take on Home Heating
If you're upgrading your heating system or choosing one for a new home, you've probably come across the term system boiler. But what exactly is it—and how does it differ from the other types?
Here’s a simple breakdown.
System Boilers: The Basics
System boilers are a type of boiler that, like conventional boilers, use a hot water cylinder to store hot water for your taps and showers. But unlike conventional setups, system boilers don’t need a separate cold water tank in the loft.
Why? Because many of the key components—like pumps and valves—are built right into the boiler itself. This makes system boilers more compact, easier to install, and generally more reliable.
You might also hear them called “sealed system” or “closed vent” boilers.
How Do System Boilers Work?
System boilers operate similarly to conventional boilers, just with a more streamlined setup:
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Cold water is drawn directly from the mains supply (no cold water tank needed).
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The water flows through a heat exchanger inside the boiler, where it's warmed up.
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When your thermostat calls for heat, a built-in pump sends hot water around your radiators.
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At the same time, hot water is stored in the cylinder, ready for when you need it.
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When you turn on a tap or shower, the system delivers instant hot water from the cylinder.
Why Choose a System Boiler?
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Great for homes with high hot water demand (like multiple bathrooms)
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No need for a cold water tank in the loft = fewer parts, less hassle
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More efficient than older conventional systems
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Works well with solar thermal systems
Need Help Choosing or Installing a Boiler?
At Fix Your Home Ltd, we specialise in modern heating systems, including the latest energy-efficient system boilers. Whether you’re upgrading from an older system or planning a new installation, we’ll make sure your setup is right for your home and family.
Contact Fix Your Home Ltd today for friendly advice and a free quote on system boiler installations.
